Reversible throttle handle



Dec. l5 1925- F. A. JIMERSON nzvxslu: THROTTLE HANDLE Filed lay yl2,1925 .MITI/nero'on HIS ATTO FY Patented Dec. 15, 1925.

estacas UNITED-STATES PATENT OFFICE.

FRANCIS A. J'IMERSON, OF ATHENS, PENNSYLVANIA, ASSIGNOR TOING-ERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OFNEW JERSEY.

REVERSIBLE THROTTLE HANDLE.

Application'flled May 12, 1925. Serial No. 29,683.

To all whom t may concern y Be it known that LFRANCIS'A. JIMERsoN, acitizen of the United States, and a resident of Athens, in the county ofBradford and State ot Pennsylvania, have invented a certain ReversibleThrottle Handle, of which the following is a specification, accompaniedby drawings.

yThis invention relates to fluid actuated rotary tools, such as rotary'drills' and the like, but more'particularly to a reversible throttlehandle for vmachines of this type, in which the reversing valve for themachine is located inside the handle'itself. A somewhat similar machineis disclosed in my copending application Serial No. 20,060 filed May 9,1925, in which the reversing valve is, however, located outside thehandle, and 0peratively connected to be actuated by movement of thehandleV sleeve. The handle valve of the present application may also beapplied to the machine in my copending application Serial No. 29,061filed May 9, 1925.

rllhe objects of the present invention are to enable the throttle valveand reversing valve to both be located inside the handle and operativelyconnected, so that the throttle valve has a neutral position to which itautomatically returns when the handle sleeve is released, and said valvemust pass through neutral position upon reversing rotation of themotor.l

The invention is shown in one of its preferred forms in the accompanyingdrawings, in which f y v Figure 1 is a longitudinal sectional view of arotary drill having my improved throttle handle applied thereto withthe'throttle valve in closed or neutral position,

Figure 2 is a detaillongitudinal sectional 'view taken through a portionof the handle in a plane at right angles to the plane ofthe section ofFigure 1 showing the throttle valve open, and

Figure 3 is a detail view of a portion of the handlepartly broken awayand in longitudinal section showing the handle cam.

Referring tothe drawings, the case A is provided with an enlargedchamber B at its rearward portion withinwhich the cylinders extend, ofwhich there are three in the present instance, only two cylinders C andD being shown in Figure 1 owing to the longitudinal section on which thedrawing is 4 nectingV rods G suitably connected to a coinmon crank ApinH on a longitudinally extending crank J operatively connected in thisinstance by gearing at the front end of the machine to drive the 'rotarydrill bit K carried in the spindle L. The pinion E on the forward end ofthe crank J meshes with Y the gear O on the spindle L as shown fordriving purposes.

The supply of pressure fluid to the ma- Achine in accordance with thisinvention is controlled by a rotatable handle sleeve P connected toactuate the throttle valve P and also the reversing valve Q both ofwhich are located inside the handle body R, which is connected to thecase A as by means of a threaded sleeve S. i

The reversing valve Q, as shown is provided with the ports S and T andpassages U for pressure fluid whereby the passages V and W in the case Amay alternately be made supply or exhaust passages, according to thedirection in which the' motor is intended to rotate the crank J.

In the position of the ports shown in Figure 1, the throttle valve P isclosed but when the valve is opened, as in Figure 2, the pressure fluidsupply enters the inlet X at the outer end of the handle body and passesto the machine through the passage V, while the exhaust passes outthrough the passage lW to the port Y and thence to atmosphere. When thevalve Q is reversed, the passage W becomes the supply port for themachine and the exhaust passes out glrirough thek passage V to theexhaust port The machine is also provided with a supplemental orauxiliary constantly o en exhaust port a except as controlled y thecooperating portion of the crank J which acts as a rotary valve butasthis auxiliary exhaust'port forms no part of the resent invention, itsfunction will not be urther described, said invention and the mode otoperation the rotary valve having been fully described in my saidcopending application Serial No. 29,061, tiled May 9, 1925. rlhe case rlis formed with the reduced bore l) in which is located the stationaryvalve bushing c having` suitable ports and passages controlled bycooperating ports in the rotation crank .l tor distributing the pressurefluid to and .trom the cylinder both on direct and reverse rotation ofthe motor.

The throttle valve P is pressed to its seat by gmeans of a valve spring`cl and an additional lighter conically wound springc is located aroundthe valve stem f and between the ,throttle valve P and the sholuder e onthe handle body R beneath the reversing valve Q. rl`he valve .stem fextends into a socket g in the reversing valve vand has a slight playtherein. The reversing` valve is bodily movable longitudinally in thehandle body R and is provided wi-th a pin and roller 7a extending'through a cam slot for-med in the wall of the handle body R. The head 7cot the pin is located in the longitudinal slot 0 in the wall ot thehandle sleeve l?. rhe cam slot in the handle body R is of angular shapeand substantially symmetrical so that as the handle sleeve is turned orrotated in one direction or the other, the longitudinal slot o forcesthe pin 7LA along one inclined side or the other of the cam slot j thusmoving the reversing` valve Q longitudinally and pushing the throttlevalve P longitudinally to Open the valve. Upon releasing the handlesleeve, the pin c automatically returns to the apex ot' the cam slot y'thus returning vthe throttle valve P to neutral or closed position. Ifdesired, means may be provided as for instance Ia 'notch at the top ofthe cam slot to hold the throttle open and to prevent the automaticreturn to neutral or closed position.

The cam slot j is also preferably deepened at the bottom as shown toproduce a distinct or semi-positive neutral position. lllhen the handlesleeve l) is rotated, the pin 7L must first litt out ot the depressionat bottom of cam slot j bringing the reversing valve Q, in operativecontact with the end or" poppet valve stem f so that further movementthen lifts the poppet valve P. A further object of the lost motionconnection between the poppet valve stem f and reversing valve Q is topermit the reversing ports to be appreciablv opened before the, motivefluid is admitted to the motor.

The depth of the depression in the bottom of the cam slot y' isv suchthat an appreciable etlort is required to turn the throttle from thisneutral position. In operation, the throttle is tirst turnedsufficiently to lift the cam roller 7L out ot' this depression beforethe reversing valve moves endwise a suthcient distance to litt thepoppct valve P.

claim:

l. ln a fluid actuated rotary tool, the combination ot a case and motor,a handle body, a rotatable handle sleeve, a springpressed throttle valveand a reversing,- valve in the -handle body, operative connectionsbetween the sleeve and the reversing valve, means for actuating thethrottle valve by movement ciE the reversing valve including means forautomatically returning the throttle valve to neutral or closed positionwhen the handle sleeve is released after .rotation on either directionfrom neutral position.

2. In a fluid actuated rotary tool, the combination ot a case and motor,a handle body, a rotatable handle sleeve, a spring` pressed throttlevalve and a. reversing valve in the handle body, operative connectionsbetween the sleeve and the reversing valvehand a cam for causinglongitudinal movement oi the reversing valve as it is rotated, andthereby actuating` the throttle valve.

In a tluid actuated rotary tool, the combination of a case and motor, ahandle body, a rotatable handle sleeve, a spring pressed throttle valveand a reversing valve in the handle body, operative connections betweenthe sleeve and the reversing valve, a cam for causing longitudinalmovement ot' the reversing' valve as it is rotated, and therebyactuating the throttle valve, said cam having oppositely inclinedsurfaces for causing` the throttle valve to return to neutral positionwhen the handle sleeve is released after rotation in either directionfrom neutral position.

4:. In a Huid actuated rotary tool, the combination of a case and motor,a handle body, a rotatable handle sleeve, a spring pressed throttlevalve and a reversingvalve in the handlebody, means for actuating thethrottle valve by movement of the reversing valve, a V-shaped cam in thehandle body, a pin carried by the reversing valve and forming a followerfor the cam, and a slot in the handle sleeve into which the pin extends,whereby rotation of the handle sleeve in either direction from neutralposition operates both valves and the throttle valve is automaticallyreturned to neutral or closed position upon release of the handle sleeveafter such rotation.

5. In a iiuid ac aiated rot-ary tool, the combination of a case andmotor, aV handle body, a rotatable handle sleeve, a spring` pressedthrottle valve and reversing valve in the handle body, a lost motionconnection for actuating the throttle valve by movement of the reversingvalve, a cam slot in the handle body having a depression at its bottom,a follower carried by the reversing valve and adapted to seat in thedepression at the bottom of the cam slot when the reversing valve is inneutral position, and a slot in the handle sleeve cooperating with thesaid follower, whereby the rotation of the handle sleeve in eitherdirection from neutral position partially opens the reversing valve be-5 fore operating the throttle valve.

throttle valve and a reversing valve in the' 10 handle body, a lostmotion connection for actuating the throttle valve by movement of thereversing valve, and means for maintaining the reversing valve inneutral position.y whereby rotation of the handle sleeve in eitherdirection from neutral position partially opens the reversing valvebefore operating the throttle valve.

In testimony whereof, I have signed this specieation. Y FRANCIS A.JIMERSON.

